Server names and ports

These are the standard server name and port details for setting up access to email, address book, files and instant messenger for your FastMail account.

If you are looking for step-by-step set up instructions to set up your email software, please review our page on how to set up an email client, or see our instructions on setting up chat or files access.

Email

We recommend using IMAP over POP to access your email. FastMail supports both protocols using the configurations below. You must use SSLTLS with all of the protocols; we do not support insecure access.

IMAP

Servermail.messagingengine.com
Port993
SSL/TLS EncryptionEnabled, but not STARTTLS
UsernameYour FastMail email address, including the domain
PasswordYour FastMail password
Root folder/pathINBOX
Folder separator. (period)

Note: Do not enable secure password authentication (SPA). It is not needed when you use SSL/TLS encryption and it will not work.

Alternate namespace. Some IMAP software (for example, Blackberry BIS, K9 Mail on Android or Apple Mail) has been known to have problems with the INBOX root folder path that FastMail uses. You can work around that by changing which port you use to access your mail. Change 993 to 992 and leave the Root folder/path blank.

POP

Servermail.messagingengine.com
Port995
SSL/TLS EncryptionEnabled, but not STARTTLS
UsernameYour FastMail email address, including the domain
PasswordYour FastMail password

POP from folder. By default, POP will pull emails from your Inbox. You can pull emails from a different folder by adding the folder name to your username. For example, yourusername+foldername@fastmail.com. This won't work for folder names with spaces or special characters.

Please note, legacy Guest and Member accounts do not have POP access. Use IMAP instead, or upgrade.

SMTP

Servermail.messagingengine.com
Port465
SSL/TLS EncryptionEnabled, but not STARTTLS
AuthenticationPLAIN
UsernameYour FastMail email address, including the domain
PasswordYour FastMail password

If your client supports STARTTLS only, you can use port 587 with STARTTLS enabled.

Please note, legacy Guest accounts do not have SMTP access. Use your ISP's SMTP server instead, or upgrade.

Calendar

FastMail supports two-way sync of your calendar via the standard CalDAV protocol. This is supported natively by iOS and many desktop calendar applications, and via a plugin on Android devices.

CalDAV

The following details are sufficient for clients that support auto-discovery of calendars over CalDAV. However, there are some clients that do not yet support this, and they require a little more work to set up. We have written step-by-step instructions for popular clients.

Serverhttps://caldav.messagingengine.com/
SSL/TLS EncryptionYes (required)
UsernameYour FastMail email address, including the domain
PasswordYour FastMail password

Files

You can access and manage your account's files using either WebDAV or FTP. Most modern browsers will allow you to view files through either but you may want to install a standalone client to help manage or modify your files. You can read more about this in our instructions of how to set up remote file access.

WebDAV

Serverhttps://dav.messagingengine.com/
UsernameYour FastMail email address, including the domain
PasswordYour FastMail password

Your {My Files} directory will be located in /username.your.domain/files/. Alternatively, use the hostname https://myfiles.messagingengine.com/ to be rooted in your {My Files} directory.

FTP

Serverftp.messagingengine.com
Port21
UsernameYour FastMail email address, including the domain
PasswordYour FastMail password

Your {My Files} directory will be in /username.your.domain/files/. FastMail also support FTPS, but not SFTP.

We've had a couple of users doing reasonable things which just happen to hit pathological cases in our filesystem implementation. To stop this happening, we've had to restrict the FTP server to one connection per user. Hopefully we can remove this limitation again soon, but for now it's needed to ensure that the service keeps working smoothly for everyone else.

Please note, legacy Guest and Member accounts do not have FTP access. Use the web interface instead, or upgrade.

Address Book

You can view your Address Book (read-only) in other software, like Outlook or Apple Mail, using LDAP.

Serverldap.messagingengine.com
Port636
SSL/TLS EncryptionEnabled (but not STARTTLS)
Username/Bind DNcn=your-username@your-domain,dc=User
LoginPLAIN
PasswordYour FastMail password
Search base/Base DNdc=AddressBook

The values are case sensitive. It must be exactly ,dc=User on the end of the username part, and the search base must be exactly dc=AddressBook.

LDAP notes

Instant messaging and XMPP/Jabber

You'll need to install a chat client to use instant messaging. See the our instructions on setting up chat for more details.

Serverchat.messagingengine.com
UsernameYour full FastMail username, including the domain, unless you are asked to enter the domain separately.
PasswordYour FastMail password
Login server
(if asked for)
Your FastMail email domain
Port5222
SSL/TLS EncryptionEnabled and must use STARTTLS

If your client only supports old-style SSL/TLS on connection, you can use port 5223 with SSL/TLS (not STARTTLS) enabled.

Alternative usernames

You need to log in to all services with your full FastMail username, including the domain, for example username@your.domain. You must use the username you used to sign up your account; aliases will not work.

Because some software has difficulty with the @ symbol in usernames, you can use any of these alternatives:

Firewall access

If you are behind a firewall, some service ports may be blocked. FastMail has a special proxy system whereby you can access each service (POP, IMAP, SMTP, etc) through any port number. All these servers use SSL/TLS. The server names are:

IMAPimaps-proxy.messagingengine.com
IMAP (alt namespace)imapalts-proxy.messagingengine.com
POPpops-proxy.messagingengine.com
SMTPsmtps-proxy.messagingengine.com
LDAPldaps-proxy.messagingengine.com
XMPPchats-proxy.messagingengine.com

If you use these server names, you can use any port to access these services. Commonly open ports include 80, 21, 25 and 443.